Week 15 — Quiz (auto-graded) · The Special Senses

Course: Anatomy & Physiology I (BIOL 2301 + BIOL 2101) · Silver Oak University (fictional sample) · Prof. Navarro
Objective tested: Objective 8 — the special senses: the eye (structure → function & the light path), rods vs. cones, the ear (ossicle order, sound path), hearing vs. equilibrium, and taste & smell as chemoreceptors.
Points: 10 (1 each) · Assignment group: Quizzes (10% of grade) · Due: end of Module 15.

This is the human-readable quiz with its vetted answer key and feedback. The import-ready Classic QTI is in F-quiz-week-15-qti.xml (generated by the shared validated script — parses with 10 items, every single-answer item exactly one correct). The reusable item-bank entries and the Canvas placement block are at the bottom of this file.

Blueprint

No trick questions; distractors target the Week 15 misconceptions named in the lecture outline.

Questions, key, and feedback

Q1 (Matching). Match each part of the eye to its function.
| Eye part | Correct function |
|---|---|
| Cornea | Refracts (bends) incoming light at the front of the eye |
| Lens | Fine-focuses light onto the retina (accommodation) |
| Retina | Contains the photoreceptors (rods and cones) |
| Iris | Adjusts the size of the pupil to control how much light enters |
Feedback: The eye's working order: the cornea does most of the refraction, the iris sets the pupil size to control light, the lens fine-focuses (accommodation), and the retina holds the photoreceptors that detect the light. "The cornea bends it, the lens aims it, the retina catches it."

Q2 (MC). Which statement correctly describes the two kinds of photoreceptors in the retina?
- A. Rods detect color and work best in bright light; cones work in dim light with no color
- B. Cones detect color and work best in bright light; rods work in dim light with no color ✅
- C. Both rods and cones detect color equally well in any light
- D. Rods focus light and cones refract it
Feedback: Cones for Color — and they need a Cone of bright light; rods for the dark (dim light, no color). A reverses them (the classic mistake); C is false (rods can't signal color); D confuses receptors with the cornea/lens, which do the focusing.

Q3 (MC). In what order does light travel through the eye on its way to the photoreceptors?
- A. retina → lens → pupil → cornea
- B. cornea → pupil → lens → retina ✅
- C. lens → cornea → retina → pupil
- D. pupil → retina → cornea → lens
Feedback: Light hits the cornea first (the front window), passes through the pupil (sized by the iris), is fine-focused by the lens, and lands on the retina. A is the path reversed; C and D scramble the front structures.

Q4 (Matching — ordering). Sound vibrations pass through the three middle-ear ossicles in a fixed order. Match each ossicle to its position in that chain (from the eardrum inward).
| Position | Correct ossicle |
|---|---|
| First ossicle (attached to the eardrum) | Malleus (hammer) |
| Second ossicle (middle of the chain) | Incus (anvil) |
| Third ossicle (attached to the inner ear) | Stapes (stirrup) |
Feedback: The ossicle chain runs malleus → incus → stapes (hammer → anvil → stirrup), from the eardrum inward. The stapes is the last link; it pushes on the inner ear's fluid, handing the vibration to the cochlea.

Q5 (MC). Which inner-ear structure converts sound vibrations into nerve signals for hearing?
- A. The semicircular canals
- B. The cochlea ✅
- C. The tympanic membrane (eardrum)
- D. The pinna (auricle)
Feedback: The coiled, fluid-filled cochlea holds the hair cells that turn sound vibrations into nerve signals on the auditory nerve. The semicircular canals do balance; the eardrum (outer/middle boundary) and pinna (outer) collect and transmit sound but don't generate the hearing signal.

Q6 (MC). The semicircular canals and vestibule of the inner ear are mainly responsible for —
- A. color vision
- B. equilibrium (balance) and detecting head movement ✅
- C. amplifying sound in the middle ear
- D. producing earwax
Feedback: The semicircular canals + vestibule (the vestibular apparatus) sense head position and movement — your sense of balance — as fluid bends their hair cells. Amplifying sound is the ossicles' job (middle ear); hearing itself is the cochlea's. "Cochlea hears; canals balance."

Q7 (Multiple answer — select all that apply). Which of the following are among the five basic tastes detected by taste buds?
- A. Sweet ✅
- B. Sour ✅
- C. Spicy (hot/chili)
- D. Bitter ✅
- E. Umami (savory) ✅
Feedback: The five basic tastes are sweet, sour, salty, bitter, and umami. Spicy is the distractor — it's detected by pain/heat receptors, not taste buds, which is why chili "burns" rather than tasting like one of the five.

Q8 (True / False). "Rods detect color and cones work best in dim light."
- True
- False ✅
Feedback: False — this is reversed. Cones detect color and work best in bright light; rods work in dim light and give no color. In a dark room only your rods fire, which is exactly why you can't see color at night.

Q9 (MC). Taste (gustation) and smell (olfaction) both rely on the same general class of sensory receptor. That class is —
- A. photoreceptors (respond to light)
- B. mechanoreceptors (respond to movement/pressure)
- C. chemoreceptors (respond to dissolved or airborne chemicals) ✅
- D. thermoreceptors (respond to temperature)
Feedback: Taste and smell are both chemoreceptors — they detect chemicals (dissolved on the tongue or airborne in the nose). Photoreceptors are in the eye (light); mechanoreceptors are in the ear (sound/pressure); thermoreceptors sense temperature.

Q10 (MC). Which statement correctly pairs a sensory structure with its function?
- A. The fovea is the spot of sharpest, most detailed vision because it is packed with cones ✅
- B. The eardrum (tympanic membrane) detects color
- C. The semicircular canals focus light onto the retina
- D. The lens converts sound into nerve impulses
Feedback: The fovea is a cone-packed pit in the retina, giving the sharpest, most detailed (and color) vision — which is why you aim what you're reading onto it. B, C, and D each pair a structure with the wrong sense entirely (the eardrum is for sound, the canals for balance, the lens for focusing light).

Answer key (quick reference)

Quality gate (self-checked): each single-answer item has exactly one correct option; the multiple-answer item (Q7) lists all four real basic tastes (A, B, D, E) and requires the "spicy" distractor (C) to be left unselected; the two matching items pair four/three items to distinct correct partners; every eye/ear structure→function pairing, the light path order, the ossicle order, and the rods-vs-cones and cochlea-vs-canals contrasts are verified against standard anatomy (OpenStax A&P "Sensory Perception"/"Special Senses" and the InnerBody eye/nervous references). Rods = dim light/no color and cones = color/bright (NOT reversed); ossicles = malleus → incus → stapes; cochlea = hearing, semicircular canals = equilibrium; taste & smell = chemoreceptors with the five basic tastes including umami. Anatomy-accuracy gate: PASS. No computation in this quiz, so no arithmetic to mis-key — the quantitative gate does not apply this week (Week 15 is conceptual/structure→function).

Item-bank entries (for variants + the midterm/final)

All ten items are tagged course=BIOL2301 · week=15 · objective=8 · topic=special-senses and deposited in Item Bank: Week 15 — The Special Senses. The final (Week 16) and the per-term variant updates draw fresh items from this bank. (Tags: q1 eye-parts-match, q2 rods-vs-cones, q3 light-path-order, q4 ossicle-order-match, q5 cochlea-hearing, q6 canals-equilibrium, q7 five-basic-tastes, q8 rods-cones-reversed-tf, q9 chemoreceptors, q10 fovea-structure-function.)

Canvas placement block

canvas_object   = Quizzes::Quiz
title           = "Week 15 Quiz — The Special Senses"
assignment_group = "Quizzes"
points_possible = 10
grading_type    = points
due_offset_days = 6        # 6 days after module start
published       = true
shuffle_answers = true
provenance      = "~ Prof. Navarro's edition · Fall 2026 · built with thecoursemaker.com"